EP2471723B1 - Gusset bag, gusset bag with mouth member, and method for manufacturing them - Google Patents
Gusset bag, gusset bag with mouth member, and method for manufacturing them Download PDFInfo
- Publication number
- EP2471723B1 EP2471723B1 EP10811955.3A EP10811955A EP2471723B1 EP 2471723 B1 EP2471723 B1 EP 2471723B1 EP 10811955 A EP10811955 A EP 10811955A EP 2471723 B1 EP2471723 B1 EP 2471723B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gusset bag
- portions
- side edge
- spout
- flat surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 44
- 238000007789 sealing Methods 0.000 claims description 249
- 238000005520 cutting process Methods 0.000 claims description 16
- 239000000853 adhesive Substances 0.000 description 18
- 230000001070 adhesive effect Effects 0.000 description 18
- 239000010410 layer Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 238000000605 extraction Methods 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000002346 layers by function Substances 0.000 description 6
- 229920005672 polyolefin resin Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000005001 laminate film Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 235000015110 jellies Nutrition 0.000 description 3
- 239000008274 jelly Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229910003437 indium oxide Inorganic materials 0.000 description 2
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229920006233 biaxially oriented polyamide Polymers 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000005026 oriented polypropylene Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920005678 polyethylene based resin Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/008—Standing pouches, i.e. "Standbeutel"
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5861—Spouts
- B65D75/5872—Non-integral spouts
- B65D75/5883—Non-integral spouts connected to the package at the sealed junction of two package walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2170/00—Construction of flexible containers
Definitions
- the present invention relates to a gusset bag, a spout-attached gusset bag, and a method of manufacturing the gusset bag and the spout-attached gusset bag.
- Standing pouches and flat bottom-type gusset bags are used as package bags for liquid or semi-liquid contents such as a jelly drink. These package bags are contrived to secure a self-standing property. Particularly, in the case of package bags for a jelly drink or the like, there is a wide use of gusset bags which can easily stand independently by the weight of the contents and are squeezed by one's hand to easily push out the contents.
- a spout-attached gusset bag for example, Patent documents 1 and 2
- a spout-attached gusset bag for example, Patent documents 1 and 2
- edge portions of a laminate film having a heat-sealable film adhered to one side thereof are heat-sealed together for the laminate film to have a cylindrical shape
- the laminate film is gusset-folded so that the heat-sealed portion is positioned on the rear surface or the side surface, and an upper edge portion and a lower edge portion are heat-sealed for the laminate film to have a bag shape with a spout liquid-tightly attached to the upper edge portion.
- the spout-attached gusset bag contains contents, the body portion swells, whereby the appearance may deteriorate.
- the Japanese patent application JP 2000-335596 A discloses a bag-shaped container with an injection outlet. Its bottom can be expanded by filling it with a liquid enabling the bag-shaped container to be self-supporting and a reinforcing means is provided on a part or the whole of one side, wherein two sheets are welded for forming the bag-shaped container.
- a spout-attached gusset bag 101 (for example, Patent document 3) which is provided with a gusset bag 110 which is formed of a pair of flat surface portions 111, 111 facing each other and a pair of side surface portions 112, 112 connecting the side edges of both of the flat surface portions 111, 111 to each other so as to be folded toward the inside of the gusset bag 110, and a spout 120 which is attached to the gusset bag 110 to discharge the contents from the gusset bag 110.
- the side edge portion of the flat surface portion 111 and the side edge portion of the side surface portion 112 are heat-sealed together, and thus a side edge sealing portion 113 is formed.
- the side edge sealing portion 113 of the spout-attached gusset bag 101 has high rigidity because the flat surface portion 111 and the side surface portion 112 are heat-sealed together. This portion functions as a support, and thus the self-standing property of the spout-attached gusset bag 101 is improved.
- the side edge sealing portion 113 functioning as a support, the swelling of the body portion when containing contents is also suppressed.
- the spout-attached gusset bag 101 has the side edge sealing portion 113, one's hand may feel pain when strongly squeezing the bag. That is, the side edge sealing portion 113 projects in the outward direction of the gusset bag 110 and has high rigidity, and an end 113a thereof is comparatively sharp. Therefore, one's hand may feel pain because the end 113a is embedded in the hand when squeezing the bag.
- the gusset bag 110 is squeezed by one's hand to push out the contents when drinking the contents. Accordingly, it is desired to cause one's hand to feel little pain even when squeezing the gusset bag 110.
- An object of the invention is to provide a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed, and a spout-attached gusset bag having a spout attached to the gusset bag.
- an object of the invention is to provide a method of manufacturing a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed, and a method of manufacturing a spout-attached gusset bag having a spout attached to the gusset bag.
- the invention employs the following configurations to solve the problem.
- a gusset bag and a spout-attached gusset bag of the invention have an excellent self-standing property, and even when squeezing the bag by one's hand, the hand is caused to feel little pain.
- a gusset bag of the invention it is possible to obtain a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed.
- a spout-attached gusset bag of the invention it is possible to obtain a spout-attached gusset bag in which a spout is attached to a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed.
- a gusset bag and a spout-attached gusset bag of the invention are gusset bags having the same form, except for the presence or absence of a spout.
- a spout-attached gusset bag having a spout will be shown and described in detail.
- a spout-attached gusset bag 1 of this embodiment has a gusset bag 10 and a spout 20 liquid-tightly attached to the gusset bag 10.
- the gusset bag 10 has a pair of flat surface portions 11, 11 facing each other, and a pair of side surface portions 12, 12 which connect the side edges of the flat surface portions 11, 11 to each other and are facing each other.
- the side surface portions 12, 12 are folded toward the inside of the gusset bag 10 by folding lines 12a which are formed at corresponding positions to each other.
- four side edge sealing portions 13 are formed by heat-sealing the side edge portions of the flat surface portions 11 and the side edge portions of the side surface portions 12 together.
- an upper sealing portion 14 in which the flat surface portions 11 and the side surface portions 12 are sealed together is formed at the upper portion of the gusset bag 10
- a lower sealing portion 15 in which the inner surfaces of the flat surface portions 11 and the inner surfaces of the side surface portions 12 are heat-sealed together is formed at the lower portion of the gusset bag 10. Accordingly, the contents can be contained in the gusset bag 10.
- the flat surface portions 11, 11 facing each other constitute the front surface and the rear surface of the spout-attached gusset bag 1.
- the flat surface portion 11 is formed of a film member.
- the film member include a single-layer film and a multilayer film having a multilayer structure.
- the film member of the flat surface portion 11 is preferably a multilayer film, and more preferably a multilayer film having a heat-sealable innermost layer, a functional layer, and an outermost layer.
- Examples of a film which is used as the innermost layer include an unstretched film formed of one or more selected from a group consisting of polyolefin resins such as low-density polyethylene (LDPE), medium-density polyethylene, high-density polyethylene, polypropylene (PP), and linear low-density polyethylene (LLDPE), mixed resins thereof, an ionomer resin, an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-acrylic acid methyl copolymer, and an ethylene-methacrylic acid copolymer.
- the thickness of the innermost layer is preferably in the range of 30 to 200 ⁇ m.
- a film having high mechanical suitability and printability is preferably used.
- films formed of synthetic resins such as polyester, polyamide, polypropylene, polycarbonate, and polyacetal. These films may be unstretched films, or stretched films stretched uniaxially or biaxially.
- a uniaxially or biaxially oriented film is preferably used.
- Specific examples thereof include an oriented plastic films and the like such as biaxially oriented polyethylene terephthalate (PET), biaxially oriented polyamide (ONY), and biaxially oriented polypropylene (OPP).
- PET biaxially oriented polyethylene terephthalate
- ONY biaxially oriented polyamide
- OPP biaxially oriented polypropylene
- synthetic paper, cellophane, paper, nonwoven cloth and the like can also be used.
- the thickness of the outermost layer is preferably in the range of 12 to 25 ⁇ m.
- the functional layer can be appropriately selected in accordance with required functions such as gas barrier properties, mechanical toughness, flex resistance, pierce resistance, shock resistance, wear resistance, cold resistance, heat resistance, and chemical resistance.
- Examples of a film which is used for the functional layer include metal foils such as aluminum, iron, copper, tin and the like, films of polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-vinyl acetate copolymer saponification product, and the like, films obtained by applying polyvinylidene chloride to the above films or vapor-depositing an inorganic material such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, and magnesium oxide, films of polyvinylidene chloride, nonwoven cloth having heat insulating properties, and a foamed film.
- metal foils such as aluminum, iron, copper, tin and the like
- the functional layer may be a single layer or two or more layers.
- the thickness of the functional layer may satisfy the functions which are required for the gusset bag 10, and is preferably in the range of 6 to 20 ⁇ m.
- a vapor-deposited film having a vapor-deposited layer provided thereon may be used in place of providing the functional layer on a film member of the flat surface portion 11.
- Examples of a vapor-deposited layer include inorganic materials such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, magnesium oxide and the like.
- the film member of the flat surface portion 11 include, for example, a film formed of PET (12 ⁇ m)/Al (7 ⁇ m)/ONY (15 ⁇ m)/LLDPE (60 ⁇ m) in order from the outermost layer.
- the same member as the film member of the flat surface portion 11 can be used as a film member of the side surface portion 12.
- the material of at least the innermost layer of the film member of the side surface portion 12 is preferably the same as the material of the innermost layer of the film member of the flat surface portion 11 in terms of sealability.
- the spout 20 has an extraction tube 21 which is inserted into the gusset bag 10 to extract the contents, and a cap 22 which is screwed to the upper portion of the extraction tube 21 to close the extraction port of the extraction tube 21.
- the spout 20 is liquid-tightly attached to the upper sealing portion 14 by heat-sealing in a state in which the extraction tube 21 is sandwiched between the upper edge portions of the flat surface portions 11, 11.
- the material of at least a part of the extraction tube 21 which is sealed with the inner surface of the flat surface portion 11 is a synthetic resin.
- Examples of a synthetic resin which forms at least the sealing portion of the extraction tube 21 of the spout 20 include a polyolefin resin, a polyamide resin, a polyester resin, a (meth)acrylic resin, a vinyl chloride resin, a vinylidene chloride resin, polyether sulfone, an ethylene-vinyl alcohol copolymer and the like.
- a polyolefin resin is preferably used in terms of excellent workability and low cost.
- Examples of a polyolefin resin include a polyethylene-based resin such as high-density polyethylene, medium-density polyethylene, high-pressure-process low-density polyethylene, linear low-density polyethylene, and an ethylene-vinyl acetate copolymer, an olefin-based elastomer such as an ethylene- ⁇ -olefin copolymer, a polypropylene-based resin such as polypropylene, an ethylene-propylene random copolymer, and an ⁇ -olefin-propylene random copolymer, a cyclic polyolefin resin and the like. These resins may be blended to improve the performance, or may be partially cross-linked for the purpose of improvement in heat resistance and the like.
- the spout 20 may be formed of a single material, or may be formed to have a multilayer structure formed of various resin layers.
- the resin which forms at least the sealing portion of the extraction tube 21 of the spout 20 is preferably the same as the resin which forms the innermost layer of the flat surface portion 11.
- a folded-back portion 13b which is a part of the side edge sealing portion 13 in the width direction thereof is folded back toward the side surface portion 12. Furthermore, the folded-back portion 13b folded toward the side surface portion 12 is adhesively fixed to a base end portion of the side edge sealing portion 13.
- the folded-back portion 13b of the side edge sealing portion 13 of the spout-attached gusset bag 1 is folded back and adhesively fixed as described above, the angular end portion 13a of the side edge sealing portion 13 does not touch one's hand but the folded line portion 13c which is rounder than the end portion 13a touches the hand when the spout-attached gusset bag 1 is squeezed. Accordingly, it is possible to push out the contents by squeezing the gusset bag 10 while causing the hand little pain.
- the folded-back portion 13b since the folded-back portion 13b is folded back and adhesively fixed, a total of four film members, that is, the two flat surface portions 11, 11 and the two side surface portions 12, 12 overlap each other in the adhered portion.
- the rigidity is further increased and the function as a support is sufficiently obtained in the portion in which the folded-back portion 13b is adhesively fixed, the spout-attached gusset bag 1 has an excellent self-standing property.
- the folded-back portion 13b of the side edge sealing portion 13 can be adhesively fixed by an adhesive.
- an adhesive include an adhesive in which a polyester resin is dispersed, a hot melt agent and the like.
- the folded-back portion 13b of the side edge sealing portion 13 may be welded by heat-sealing.
- the four film members overlap each other.
- the folded-back portion 13b of the side edge sealing portion 13 is also folded back and adhesively fixed in the upper sealing portion 14, the number of film members increases by an amount corresponding to the folded-back portion 13 at the side edge of the upper sealing portion 14, and thus the eight film members overlap each other. In this manner, when the number of film members increases at the side edge of the upper sealing portion 14, the overlapping state of the film members in the upper sealing portion 14 becomes non-uniform.
- the folded-back portion 13b of the side edge sealing portion 13 is preferably removed. Accordingly, the upper sealing portion 14 becomes uniform and the sealing can thus be easily and sufficiently performed, whereby the contents are easily prevented from leaking.
- punch holes are formed at positions facing each other in the vicinities of the side edges of the side surface portions 12, 12 facing each other, and inner surfaces 11 a, 11 a of the flat surface portions 11, 11 are heat-sealed in the punch holes to form sealing portions 16.
- the outer surfaces of the side surface portions 12, 12 in the upper sealing portion 14 may be directly adhered to each other by an adhesive, a heat-sealable film or a double-sided adhesive tape.
- Examples of a method of manufacturing the gusset bag of the invention include a method ( ⁇ ) having the following steps ( ⁇ 1) to ( ⁇ 4).
- the spout is attached, in the step ( ⁇ 4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- two long film members (C) 11B which form the pair of flat surface portions 11 facing each other and a plurality of long film members (D) 12B which are center-folded along the longitudinal direction and form the pair of side surface portions 12 facing each other are conveyed by a roller or the like.
- the plurality of film members (D) 12B are disposed in parallel to each other between the two film members (C) 11B.
- the film members (D) 12B are disposed so that the fold lines of the center-folded film member (D) 12B positioned at both ends are directed to the inside, and the fold lines of the film members (D) 12B parallel to each other are alternately directed to the right and left.
- an adhesive is applied to an adhesion portion 13d for the case in which the folded-back portion 13b is adhesively fixed.
- heat-sealing portions 13B to be the side edge sealing portions 13 of the spout-attached gusset bag 1 are formed.
- the heat-sealing portion 13B of the film members (C) 11B and (D) 12B is cut along the straight line R, that is, along the longitudinal direction between the side edge portions, facing each other, of the two film members (D) 12B to cut out a plurality of cylindrical film members having the flat surface portions 11, 11 and the side surface portions 12, 12 in which the four side edge sealing portions 13 are formed as shown in FIGS. 7 and 8 .
- a sealing portion 13e is removed so that the folded-back portion 13b is removed at the upper sealing portion 14 of the spout-attached gusset bag 1.
- Each folded-back portion 13b of the side edge sealing portion 13 in the cylindrical film member obtained in the step ( ⁇ 3) is folded back toward the side surface portion 12 to be adhesively fixed by the adhesive applied to the adhesion portion 13d.
- the inner surfaces of the flat surface portions 11 and the inner surface of the side surface portions 12 at a portion to be the lower sealing portion 15 are heat-sealed to each other along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (C) 11B and (D) 12B.
- the film members (C) 11B and (D) 12B are cut along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (C) 11B and (D) 12B, and divided into a plurality of pieces in the longitudinal direction to obtain bag-shaped film members in which the lower sealing portion 15 is formed in the lower portions of the flat surface portions 11 and the side surface portions 12.
- the sealing of the inner surfaces of the flat surface portions 11 and the contact surfaces of the flat surface portion 11 and the side surface portion 12, and the attachment of the spout 20 are performed by heat-sealing. Furthermore, the outer surfaces of the side surface portions 12 are sealed together to form the upper sealing portion 14. Examples of a method of sealing the outer surfaces of the side surface portions 12 to each other in the upper sealing 14 include the following method.
- punch holes 12b, 12b are formed to be facing each other in the vicinity of the side edge of the folded side surface portion 12 in the upper portion of the side edge sealing portion 13, and as shown in FIGS. 9B and 9C , the inner surfaces 11a, 11a of the flat surface portions 11 facing each other are brought into contact with each other and heat-sealed in the portions corresponding to the punch holes 12b, 12b to form a sealing portion 16, whereby the outer surfaces of the side surface portions 12 are sealed together.
- a method of sealing the outer surfaces of the side surface portions 12 in the upper sealing portion 14 to each other a method of fixing the outer surfaces of the side surface portions 12 to each other by using an adhesive, a heat-sealable film or a double-sided adhesive tape is provided as an example.
- the spout-attached gusset bag 1 can be obtained by the above-described steps.
- the method ( ⁇ ) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- any of the operation of forming the lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming the upper sealing portion 14 and attaching the spout 20 may be performed first, or the operations may be performed at the same time.
- the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout.
- the operation of folding back and adhesively fixing the side edge sealing portion 13 in the step ( ⁇ 3) is not limited to being before the step ( ⁇ 4).
- the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed.
- the side edge sealing portion 13 may be fixed by heat-sealing without using the adhesive.
- examples of a method of manufacturing the gusset bag other than the method ( ⁇ ) include a method ( ⁇ ) having the following steps ( ⁇ 1) to ( ⁇ 4).
- the spout is attached, in the step ( ⁇ 4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- two long film members (E) 11A which form the pair of flat surface portions 11 facing each other and a plurality of long cylindrical film members (F) 12A which form the pair of side surface portions 12 facing each other are conveyed by a roller or the like so that the plurality of film members (F) 12A are in parallel to each other between the two film members (E) 11A.
- an adhesive is applied to the adhesion portion 13d for the case in which the folded-back portion 13b is adhesively fixed.
- heat-sealing portions 13A to be the side edge sealing portions 13 of the spout-attached gusset bag 1 are formed.
- the heat-sealing portion 13A is formed so that the center portion thereof in the direction perpendicular to the longitudinal direction is not heat-sealed.
- the heat-sealing portion 13A of the film members (E) 11 A and (F) 12A is cut along the straight line X, that is, along the longitudinal direction at the non-heat-sealed portion of the center portion of the heat-sealing portion 13A to cut out a plurality of cylindrical film members having the flat surface portions 11, 11 and the side surface portions 12, 12 in which the four side edge sealing portions 13 are formed as shown in FIGS. 7 and 8 .
- the sealing portion 13e is removed so that the folded-back portion 13b is removed at the upper sealing portion 14 of the spout-attached gusset bag 1.
- Each folded-back portion 13b of the side edge sealing portion 13 in the cylindrical film member obtained in the step ( ⁇ 2) is folded back toward the side surface portion 12 to be adhesively fixed by the adhesive applied to the adhesion portion 13d.
- the inner surfaces of the flat surface portions 11 and the inner surface of the side surface portions 12 at a portion to be the lower sealing portion 15 are heat-sealed to each other along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (E) 11A and (F) 12A.
- the film members (E) 11A and (F) 12A are cut along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (E) 11 A and (F) 12A, and divided into a plurality of pieces in the longitudinal direction to obtain bag-shaped film members in which the lower sealing portion 15 is formed in the lower portions of the flat surface portions 11 and the side surface portions 12.
- the sealing of the inner surfaces of the flat surface portions 11 and the contact surfaces of the flat surface portion 11 and the side surface portion 12, and the attachment of the spout 20 are performed by heat-sealing. Furthermore, the outer surfaces of the side surface portions 12 are sealed together to form the upper sealing portion 14.
- the method of sealing the outer surfaces of the side surface portions 12 in the upper sealing 14 can be performed in the same manner as in the step ( ⁇ 4) of the method ( ⁇ ).
- the spout-attached gusset bag 1 can be obtained by the above-described steps.
- the method ( ⁇ ) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- any of the operation of forming the lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming the upper sealing portion 14 and attaching the spout 20 may be performed first, or the operations may be performed at the same time.
- the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout.
- the operation of folding back and adhesively fixing the side edge sealing portion 13 in the step ( ⁇ 3) is not limited to being before the step ( ⁇ 4).
- the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed.
- the side edge sealing portion 13 may be fixed by heat-sealing without using the adhesive.
- the center portion of the film member (F) 12A in the width direction may not be in a non-heat-sealed state, and may be continuously heat-sealed.
- the same long film members center-folded along the longitudinal direction as those in the method ( ⁇ ) are preferably conveyed so as to be placed at both side ends of the two film members (E) 11A so that the fold lines thereof are directed to the inside, to heat-seal the side edge portions of the center-folded film members and the two film members (E) 11A. Accordingly, it is possible to make full use of both side ends of the film member (E) 11A in the manufacturing of the gusset bag.
- the method ( ⁇ ) is more preferably used than the method ( ⁇ ).
- the folded-back portion 13b of the side edge sealing portion 13 in which the side edge portion of the flat surface portion 11 and the side edge portion of the side surface portion 12 are heat-sealed together is folded back toward the side surface portion 12 and adhesively fixed. Accordingly, when the gusset bag 1 is squeezed by one's hand, the end portion 13a does not touch the hand, but the folded line portion 13c touches the hand. Since the folded line portion 13c is round with no edges, one's hand is caused to feel little pain even when the contents are pushed out by squeezing the gusset bag 1.
- the gusset bag of this embodiment is not limited to the above-described spout-attached gusset bag 1.
- the folded-back portion 13b of the side edge sealing portion 13 may be folded back toward the flat surface portion 11 and adhesively fixed.
- the entire side edge sealing portion 13 may be folded back toward the flat surface portion 11 and adhesively fixed to the flat surface portion 11.
- the entire side edge sealing portion 13 may be folded back toward the side surface portion 12 and adhesively fixed to the side surface portion 12.
- the entire side edge sealing portion 13 is preferably folded back toward the flat surface portion 11 or the side surface portion 12.
- the film members are preferably cut along the straight line Z as shown in FIG. 11 , that is, the film members are preferably cut so that the side edge sealing portion 13 is further shortened.
- the manufacturing method when the entire side edge sealing portion 13 is folded back toward the flat surface portion 11 or the side surface portion 12 it is preferable to use a method of folding back and adhesively fixing the entire side edge sealing portion 13 in a state in which a quadrangular prism-shaped mandrel 40 (support) is inserted into the cylindrical film member formed of the flat surface portions 11, 11 and the side surface portions 12, 12 as shown in FIG. 12 .
- this method it is possible to easily fold back and adhesively fix the side edge sealing portion 13, and thus the spout-attached gusset bag can be more efficiently manufactured.
- two or more of the four kinds of folding-back methods illustrated in FIGS. 3 and 10A to 10C may be used in combination for the four side edge sealing portions 13. That is, in the gusset bag of this embodiment, a form of folding back the entire side edge sealing portion 13 and a form of folding back a part of the side edge sealing portion 13 may be used in combination, and a form of folding back the side edge sealing portion 13 toward the flat surface portion 11 and a form of folding back the side edge sealing portion 13 toward the side surface portion 12 may be used in combination.
- the number of the side edge sealing portions 13 is not limited to four, and may be less than four.
- a spout-attached gusset bag in which the number of the side edge sealing portions 13 is not four is preferably a spout-attached gusset bag in which one flat surface portion and a pair of side surface portions are formed of one film member, and the side edge portions of the side surface portions formed of the above film member and the side edge portions of the other flat surface portion are heat-sealed together to form the two side edge sealing portions.
- the spout-attached gusset bag preferably has a gusset bag 10A in which the flat surface portion 11 to be the front surface of the bag and the pair of side surface portions 12 facing each other are formed of one integrated film member, the side edge portions of the side surface portions 12, 12 of the above film member and the side edge portions of the other flat surface portion 11 are heat-sealed together to form the two side edge sealing portions 13, and a part of the side edge sealing portion 13 is folded back toward the side surface portion 12 and adhesively fixed.
- the entire side edge sealing portion 13 may be folded back, the side edge sealing portion 13 may be folded back toward the flat surface portion 11, or these may be used in combination.
- the spout-attached gusset bag particularly preferably has a gusset bag 10B in which the flat surface portion 11 to be the front surface of the bag and the pair of side surface portions 12 facing each other are formed of one integrated film member, the side edge portions of the side surface portions 12, 12 of the above film member and the side edge portions of the other flat surface portion 11 are heat-sealed together to form the two side edge sealing portions 13, and the entire side edge sealing portion 13 is folded back toward the front surface portion 11 which forms the rear surface and adhesively fixed.
- the spout-attached gusset bag having the gusset bag 10B has no side edge sealing portion in the front surface, and thus one's hand is caused to feel little pain particularly when squeezing the bag from the front surface, and the appearance is also excellent.
- the side edge sealing portions are formed of the flat surface portion which form the rear surface and the side surface portions at both sides of the flat surface portion, an excellent self-standing property can be obtained due to the side edge sealing portion functioning as a support, and the swelling of the body portion when containing contents is also suppressed.
- the spout-attached gusset bag of the invention may be a gusset bag 10C in which one side surface portion and a pair of flat surface portions facing each other are integrally formed of one film member , the two side edge sealing portions 13 by heat-sealing are formed only in the side of the other side surface portion, and the side edge sealing portion 13 is folded back toward the flat surface portion or the side surface portion and adhesively fixed.
- the side edge sealing portion 13 may be formed by heat-sealing a portion corresponding to the side edge portion of the flat surface portion 11 and a portion corresponding to the side edge portion of the side surface portion 12 to each other, and all or a part of the side edge sealing portion 13 may be folded back toward the flat surface portion 11 or the side surface portion 12, and adhesively fixed. Accordingly, it is possible to prevent one's hand from feeling pain when the gusset bag is squeezed and improve the self-standing property of the spout-attached gusset bag by forming the side edge sealing portion to be a support.
- the folded-back portion 13b of the side edge sealing portion 13 may not be necessarily adhesively fixed to the flat surface portion 11 or the side surface portion 12 if the folded-back state can be stably maintained.
- Examples of a method of manufacturing the gusset bag having the same form as those of the gusset bags 10A and 10B include a method ( ⁇ ) having the following steps ( ⁇ 1) to ( ⁇ 4).
- the spout is attached, in the step ( ⁇ 4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- a long film member (A) 17 which forms one flat surface portion 11 and the pair of side surface portions 12, 12 is conveyed by a roller or the like with a long film member (B) 18 which forms the other flat surface portion 11 in a state in which the film member (A) 17 is folded so that a plurality of the one flat surface portion 11 and the pair of side surface portions 12, 12 are formed in parallel to each other along the longitudinal direction.
- an adhesive is applied to the adhesion portion 13d for the case in which the folded-back portion is adhesively fixed.
- the portion between the neighboring side surface portions 12 of the film member (A) 17 and the film member (B) 18 are heat-sealed together along the longitudinal direction, and each of the portions at the side ends from the side surface portions positioned at both ends of the film member (A) 17 and the film member (B) 18 are heat-sealed together along the longitudinal direction, whereby the heat-sealing portions 13C to be the side edge sealing portions 13 are formed.
- the heat-sealing portion 13C of the film members (A) 17 and (B) 18 is cut along the straight line Q, that is, along the longitudinal direction at the center portion of the heat-sealing portion 13C to cut out a plurality of cylindrical film members having the flat surface portions 11, 11 and the side surface portions 12, 12 in which the two side edge sealing portions 13 are formed as shown in FIG. 15 .
- Each of the entire side edge sealing portions 13 of the cylindrical film member obtained in the step ( ⁇ 2) is folded back toward the flat surface portion 11 to be adhesively fixed by the adhesive applied to the adhesion portion 13d.
- the heat-sealing and cutting are performed along the direction perpendicular to the longitudinal direction and the division into a plurality of pieces is performed in the longitudinal direction, whereby bag-shaped film members are obtained in which the lower sealing portion 15 is formed.
- the sealing of the upper portions of the flat surface portions 11 and the side surface portions 12 and the attachment of the spout 20 are performed.
- the method ( ⁇ ) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- any one of the operation of forming the lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming the upper sealing portion 14 and attaching the spout 20 may be performed first, or the operations may be performed at the same time.
- the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout.
- the operation of folding back and adhesively fixing the side edge sealing portion 13 in the step ( ⁇ 3) is not limited to being before the step ( ⁇ 4).
- the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed.
- the side edge sealing portion 13 may be fixed by heat-sealing without using the adhesive.
- a spout-attached gusset bag 2 of this embodiment has a gusset bag 30 and a spout 20 liquid-tightly attached to the gusset bag 30.
- the gusset bag 30 has a pair of flat surface portions 31, 31 facing each other, and a pair of side surface portions 32, 32 which connect the side edges of the flat surface portions 31, 31 to each other and are facing each other.
- the side surface portions 32, 32 are folded toward the inside of the gusset bag 30 by folding lines 32a which are formed at corresponding positions to each other.
- four side edge sealing portions 33 are formed by heat-sealing the side edge portions of the flat surface portions 31 and the side edge portions of the side surface portions 32 together.
- an upper sealing portion 34 in which the flat surface portions 31 and the side surface portions 32 are put together and sealed is formed at the upper portion of the gusset bag 30, and a lower sealing portion 35 in which the inner surfaces of the flat surface portions 31 and the inner surface of the side surface portions 32 are heat-sealed together is formed at the lower portion of the gusset bag 30. Accordingly, the contents can be contained in the gusset bag 30.
- the film members of the flat surface portion 31 and the side surface portion 32 it is possible to use the same material as the film members of the flat surface portion 11 and the side surface portion 12 of the spout-attached gusset bag 1, and a preferred aspect regarding the film member is similar. That is, the spout-attached gusset bag 2 is the same as the spout-attached gusset bag 1, other than the form of the side edge sealing portion 33.
- the side edge sealing portion 33 of the spout-attached gusset bag 2 has an unsealed portion 33b which is not heat-sealed along the vertical direction in the middle of the side edge sealing portion 33 in the width direction thereof.
- a tip end portion (folded-back portion 33c) of the side edge sealing portion 33 is folded back toward the side surface portion 32 along the unsealed portion 33b, and adhesively fixed to a base end portion of the side edge sealing portion 33.
- a sealing portion 33a which is heat-sealed, the unsealed portion 33b which is not heat-sealed, and the folded-back portion 33c which his heat-sealed are provided.
- the tip end of a portion projecting to the outside from the gusset bag 30 of the side edge sealing portion 33 is the unsealed portion 33b. Since the unsealed portion 33b is not heat-sealed, the unsealed portion 33b has lower rigidity and is softer than the folded line portion 13c of the side edge sealing portion 13 of the spout-attached gusset bag 1.
- the sealing portion 33a and the folded-back portion 33c are heat-sealed together, these portions sufficiently function as a support, and thus the gusset bag 2 has an excellent self-standing property.
- the spout-attached gusset bag 2 is manufactured in the same manner as in the manufacturing of the spout-attached gusset bag 1 by the method ( ⁇ ) or ( ⁇ ), except for the form of the heat-sealing portion which is formed in the step ( ⁇ 2) or ( ⁇ 2) and the folding-back of the side edge sealing portion in the step ( ⁇ 3) or ( ⁇ 3).
- the method ( ⁇ ) for example, the following method is exemplified.
- two long film members (E) 31 A which form the pair of flat surface portions 31 facing each other and a plurality of long cylindrical film members (F) 32A which form the pair of side surface portions 32 facing each other are conveyed by a roller or the like so that the plurality of film members (E) 32A are in parallel to each other between the film members (E) 31 A.
- an adhesive is applied to an adhesion portion 33d for the case in which the folded-back portion 33c is adhesively fixed.
- heat-sealing portions to be the side edge sealing portions 33 are formed.
- the heat-sealing portions are formed in order of a sealing portion 33A which is heat-sealed, an unsealed portion 33B which is not heat-sealed, a sealing portion 33C which is heat-sealed, an unsealed portion 33B which is not heat-sealed, and a sealing portion 33A which is heat-sealed, in the direction perpendicular to the longitudinal direction.
- the heat-sealing portion of the film members (C) 31 A and (D) 32A is cut along the straight line P, that is, along the longitudinal direction at the center of the film member 32A in the direction perpendicular to the longitudinal direction to cut out a plurality of cylindrical film members having the flat surface portions 31,31 and the side surface portions 32, 32 in which the four side edge sealing portions 33 are formed as shown in FIG 20 .
- a part of the folded-back portion 33c is removed so that the folded-back portion 33c does not remain in a portion corresponding to the upper sealing portion 34 of the spout-attached gusset bag 2.
- Each folded-back portion 33c of the side edge sealing portions 33 in the cylindrical film members obtained in the step ( ⁇ 2) is folded back toward the side surface portion 32 along the unsealed portion 33b to adhesively fix the folded-back portion 33c by the adhesive applied to the adhesion portion 33d.
- the inner surfaces of the flat surface portions 31 and the inner surface of the side surface portions 32 at a portion to be the lower sealing portion 35 are heat-sealed to each other along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction, and the above portion is cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, whereby bag-shaped film members in which the lower sealing portion 35 is formed in the lower portions of the flat surface portions 31 and the side surface portions 32 are obtained.
- the sealing of the inner surfaces of the flat surface portions 31 and the contact portions of the flat surface portion 31 and the side surface portion 32, and the attachment of the spout 20 are performed by heat-sealing. Furthermore, the outer surfaces of the side surface portions 32 are sealed together to form the upper sealing portion 34.
- Examples of a method of sealing the outer surfaces of the side surface portions 32 to each other in the upper sealing 34 include a method including: forming punch holes facing each other in the side surface portions 32 at the upper portions of the side edge sealing portions 33; and bringing the inner surfaces of the flat surface portions 31 into contact with each other in the punch holes to heat-seal the inner surfaces to each other as in the case of manufacturing the spout-attached gusset bag 1.
- a method of fixing the outer surfaces of the side surface portions 32 to each other by using an adhesive, a heat-sealable film or a double-sided adhesive tape may also be used.
- the spout-attached gusset bag 2 can be obtained by the above-described steps.
- the method of manufacturing the spout-attached gusset bag 2 is also not limited to the above-described method as in the case of manufacturing the spout-attached gusset bag 1.
- any of the operation in the step ( ⁇ 4), the operation of forming the lower sealing portion 35, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming the upper sealing portion 34 and attaching the spout 20 may be performed first, or the operations may be performed at the same time.
- the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout.
- the operation of folding back and adhesively fixing the folded back portion 33c of the side edge sealing portion 33 in the step ( ⁇ 3) is not limited to being before the step ( ⁇ 4).
- the folded-back portions 33c of the side edge sealing portions 33 of the divided cylindrical film members may be folded back and adhesively fixed.
- the side edge sealing portion 13 may be fixed by heat-sealing without using the adhesive.
- the long film members center-folded along the longitudinal direction are preferably conveyed so as to be placed at both side ends of the two film members (E) 31A so that the fold lines thereof are directed to the inside, to heat-seal the side edge portions of the center-folded film members and the two film members (E) 31 A. Accordingly, it is possible to make full use of both side ends of the film member (E) 31 A in the manufacturing of the gusset bag.
- a sealing portion which is heat-sealed, an unsealed portion which is not heat-sealed, and a sealing portion which is heat-sealed are formed in this order, in the direction perpendicular to the longitudinal direction.
- the folded-back portion 33c of the side edge sealing portion 33 in which the side edge portion of the flat surface portion 31 and the side edge portion of the side surface portion 32 are heat-sealed together is folded back toward the side surface portion 32 along the unsealed portion 33b and adhesively fixed. Accordingly, when the spout-attached gusset bag 2 is squeezed by one's hand, the round unsealed portion 33b which is not heat-sealed and has low rigidity touches the hand. Therefore, it is possible to push out the contents by squeezing the spout-attached gusset bag 2 while causing the hand to feel little pain.
- the spout-attached gusset bag of this embodiment is not limited to the above-described spout-attached gusset member 2.
- the folded-back portion 33c may be folded back toward the flat surface portion 11 and adhesively fixed.
- the side edge sealing portions in which the folded-back portion 33c is folded back toward the flat surface portion 11 and the side edge sealing portions in which the folded-back portion 33c is folded back toward the side surface portion 12 may be used in combination.
- the number of the side edge sealing portions 33 is not limited to four, and may be less than four.
- a film member in which one side surface portion is formed integrally with a pair of flat surface portions facing each other may be used to form the side edge sealing portions 33 by heat-sealing only in the side of the other side surface portion, and the folded-back portion 33c may be folded back along the unsealed portion 33b and adhesively fixed.
- the side edge sealing portion 33 may be formed by heat-sealing a portion corresponding to the side edge portion of the flat surface portion 31 and a portion corresponding to the side edge portion of the side surface portion 32 to each other, and the folded-back portion 33c of the side edge sealing portion 33 may be folded back toward the flat surface portion 31 or the side surface portion 32 along the unsealed portion 33b, and adhesively fixed. Accordingly, it is possible to prevent one's hand from feeling pain when the gusset bag is squeezed and improve the self-standing property of the gusset bag by forming the side edge sealing portion to be a support.
- the spout-attached gusset bag of the invention may be a spout-attached gusset bag having a gusset bag in which the folding-back of the side edge sealing portion described in the first embodiment and the folding-back of the side edge sealing portion described in the second embodiment are used in combination.
- the gusset bag of the invention is a bag which is the same as the above-described spout-attached gusset bag, except that the gusset bag of the invention has no spout.
- a notch or a cutoff line to open the bag may be formed.
- gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when squeezing the gusset bag, and to provide a spout-attached gusset bag having the gusset bag with a spout attached thereto.
Description
- The present invention relates to a gusset bag, a spout-attached gusset bag, and a method of manufacturing the gusset bag and the spout-attached gusset bag.
- Standing pouches and flat bottom-type gusset bags are used as package bags for liquid or semi-liquid contents such as a jelly drink. These package bags are contrived to secure a self-standing property. Particularly, in the case of package bags for a jelly drink or the like, there is a wide use of gusset bags which can easily stand independently by the weight of the contents and are squeezed by one's hand to easily push out the contents.
- As a specific example of the gusset bag, for example, a spout-attached gusset bag (for example,
Patent documents 1 and 2) is known in which edge portions of a laminate film having a heat-sealable film adhered to one side thereof are heat-sealed together for the laminate film to have a cylindrical shape, the laminate film is gusset-folded so that the heat-sealed portion is positioned on the rear surface or the side surface, and an upper edge portion and a lower edge portion are heat-sealed for the laminate film to have a bag shape with a spout liquid-tightly attached to the upper edge portion. However, when the spout-attached gusset bag contains contents, the body portion swells, whereby the appearance may deteriorate. - The Japanese patent application
JP 2000-335596 A - Meanwhile, as shown in
FIGS. 21 A and 21 B , a spout-attached gusset bag 101 (for example, Patent document 3) is known which is provided with agusset bag 110 which is formed of a pair offlat surface portions side surface portions flat surface portions gusset bag 110, and aspout 120 which is attached to thegusset bag 110 to discharge the contents from thegusset bag 110. - In the spout-attached
gusset bag 101, the side edge portion of theflat surface portion 111 and the side edge portion of theside surface portion 112 are heat-sealed together, and thus a sideedge sealing portion 113 is formed. The sideedge sealing portion 113 of the spout-attachedgusset bag 101 has high rigidity because theflat surface portion 111 and theside surface portion 112 are heat-sealed together. This portion functions as a support, and thus the self-standing property of the spout-attachedgusset bag 101 is improved. In addition, due to the sideedge sealing portion 113 functioning as a support, the swelling of the body portion when containing contents is also suppressed. -
- [Patent document 1]
Japanese Patent Application, First Publication No. H11-147547 - [Patent document 2]
Japanese Patent Application, First Publication No. 2000-72161 - [Patent document 3]
Japanese Patent Application, First Publication No. 2004-196414 - However, since the spout-attached
gusset bag 101 has the sideedge sealing portion 113, one's hand may feel pain when strongly squeezing the bag. That is, the sideedge sealing portion 113 projects in the outward direction of thegusset bag 110 and has high rigidity, and anend 113a thereof is comparatively sharp. Therefore, one's hand may feel pain because theend 113a is embedded in the hand when squeezing the bag. Particularly, in the case in which the contents are a jelly drink or the like, in general, thegusset bag 110 is squeezed by one's hand to push out the contents when drinking the contents. Accordingly, it is desired to cause one's hand to feel little pain even when squeezing thegusset bag 110. - As a method to cause one's hand to feel little pain when squeezing the bag, there is a method of not forming the side
edge sealing portion 113 by using a cylindrical gusset bag in which all of theflat surface portions side surface portions edge sealing portion 113 functioning as a support is not present, the self-standing property of the gusset bag deteriorates. - An object of the invention is to provide a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed, and a spout-attached gusset bag having a spout attached to the gusset bag.
- In addition, an object of the invention is to provide a method of manufacturing a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed, and a method of manufacturing a spout-attached gusset bag having a spout attached to the gusset bag.
- The invention employs the following configurations to solve the problem.
- [1] A gusset bag including: a pair of flat surface portions facing each other; and a pair of side surface portions facing each other which are folded toward the inside thereof, has a side edge sealing portion in which the flat surface portion and the side surface portion are heat-sealed together at side edge portions thereof, and a folded-back portion in which the entire side edge sealing portion is folded back and adhesively fixed to the flat surface portion or the side surface portion, so that the entire side edge sealing portion is overlapped with the flat surface portion or the side surface portion, wherein one flat surface portion and the pair of side surface portions are formed of one film member, and side edge portions of the side surface portions opposite to the one flat surface portion formed of the film member and side edge portions of the other flat surface portion are heat-sealed together to form the two side edge sealing portions.
- [2] The gusset bag according to [1], in which the pair of flat surface portions and the pair of side surface portions have no folded-back portion at upper end portions thereof.
- [3] A spout-attached gusset bag in which a spout is attached to an opening portion of the gusset bag according to [1] or [2].
- [4] A method of continuously manufacturing the gusset bag according to [1], which is a method of manufacturing a gusset bag including the following steps of (α1) to (α4).
- (α1) a step of conveying a long film member (A) which forms one flat surface portion and a pair of side surface portions with a long film member (B) which forms the other flat surface portion in a state in which the long film member (A) is folded so that a plurality of the one flat surface portion and the pair of side surface portions are formed in parallel to each other along a longitudinal direction, to heat-seal a portion between the neighboring side surface portions of the film member (A) to the film member (B) along the longitudinal direction and heat-seal each of the portions at the side ends from the side surface portions positioned at both ends of the film member (A) to the film member (B) along the longitudinal direction.
- (α2) a step of cutting a heat-sealing portion of the film members (A) and (B) along the longitudinal direction to obtain a plurality of cylindrical film members having the flat surface portions and the side surface portions in which the two side edge sealing portions are formed.
- (α3) a step of folding back all or a part of the side edge sealing portion in the width direction toward the flat surface portion or the side surface portion.
- (α4) a step of heat-sealing and cutting the cylindrical film member along a direction perpendicular to the longitudinal direction to divide the cylindrical film member into a plurality of pieces in the longitudinal direction, wherein
in the step of folding back the side edge sealing portion, the entire side edge sealing portion is adhesively fixed to the flat surface portion or the side surface portion so that the entire side edge sealing portion is overlapped with the flat surface portion or the side surface portion.
- [5] A method of manufacturing a spout-attached gusset bag using the method of manufacturing the gusset bag according to [4], in which a spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided in the longitudinal direction is sealed.
- A gusset bag and a spout-attached gusset bag of the invention have an excellent self-standing property, and even when squeezing the bag by one's hand, the hand is caused to feel little pain.
- In addition, according to a method of manufacturing a gusset bag of the invention, it is possible to obtain a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed.
- In addition, according to a method of manufacturing a spout-attached gusset bag of the invention, it is possible to obtain a spout-attached gusset bag in which a spout is attached to a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when being squeezed.
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FIG. 1 is a front view showing an example of an embodiment of a spout-attached gusset bag not forming part of the invention. -
FIG. 2 is a cross-sectional view in which the spout-attached gusset bag ofFIG. 1 is cut along the line I-I'. -
FIG. 3 is an enlarged cross-sectional view of the vicinity of a side edge sealing portion of the spout-attached gusset bag ofFIG. 2 . -
FIG. 4 is a perspective view showing an aspect in which the spout-attached gusset bag ofFIG. 1 is filled with contents. -
FIG. 5A is a perspective view showing a step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 5B is a cross-sectional view showing the step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 6A is a perspective view showing a step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 6B is a cross-sectional view showing the step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 7 is a perspective view showing a step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 8 is a cross-sectional view showing the step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 9A is a cross-sectional view of upper portions of flat surface portions showing a step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 9B is a cross-sectional view of upper portions of side surface portions showing a step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 9C is an enlarged view of the vicinity of an upper sealing portion of the gusset bag showing the step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 10A is a cross-sectional view showing another form of the side edge sealing portion of the gusset bag. -
FIG. 10B is a cross-sectional view showing another form of the side edge sealing portion of the gusset bag. -
FIG. 10C is a cross-sectional view showing another form of the side edge sealing portion of the gusset bag. -
FIG. 11 is a view showing a step of manufacturing a gusset bag of another embodiment. -
FIG. 12 is a cross-sectional view showing the step of manufacturing the spout-attached gusset bag ofFIG. 1 . -
FIG. 13 A is a cross-sectional view showing an embodiment of the spout-attached gusset bag of the invention. -
FIG. 13B is a cross-sectional view showing another embodiment of the spout-attached gusset bag of the invention. -
FIG. 13C is a cross-sectional view showing another embodiment of the spout-attached gusset bag. -
FIG. 13D is a cross-sectional view showing another form of the side edge sealing portion of the gusset bag. -
FIG. 14A is a perspective view showing a step of manufacturing of another example of the spout-attached gusset bag of the invention. -
FIG. 14B is a perspective view showing the step of manufacturing of another example of the spout-attached gusset bag of the invention. -
FIG. 15 is a cross-sectional view showing the step of manufacturing of another example of the spout-attached gusset bag of the invention. -
FIG. 16 is a front view showing another embodiment of the spout-attached gusset bag not forming part of the invention. -
FIG. 17 is a cross-sectional view in which the spout-attached gusset bag ofFIG. 16 is cut along the line II-II'. -
FIG. 18 is an enlarged cross-sectional view of the vicinity of a side edge sealing portion of the spout-attached gusset bag ofFIG. 17 . -
FIG. 19 is a cross-sectional view showing a step of manufacturing the spout-attached gusset bag ofFIG. 16 . -
FIG. 20 is a cross-sectional view showing the step of manufacturing the spout-attached gusset bag ofFIG. 16 . -
FIG. 21 A is a front view showing an example of a conventional spout-attached gusset bag. -
FIG. 21 B is a cross-sectional view taken along the line III-III' of the spout-attached gusset bag ofFIG. 21 A . - A gusset bag and a spout-attached gusset bag of the invention are gusset bags having the same form, except for the presence or absence of a spout. Hereinafter, as an embodiment of the gusset bag and the spout-attached gusset bag of the invention, an example of a spout-attached gusset bag having a spout will be shown and described in detail.
- As shown in
FIG. 1 , a spout-attachedgusset bag 1 of this embodiment has agusset bag 10 and aspout 20 liquid-tightly attached to thegusset bag 10. - As shown in
FIGS. 1 and 2 , thegusset bag 10 has a pair offlat surface portions side surface portions flat surface portions side surface portions gusset bag 10 byfolding lines 12a which are formed at corresponding positions to each other. Moreover, four sideedge sealing portions 13 are formed by heat-sealing the side edge portions of theflat surface portions 11 and the side edge portions of theside surface portions 12 together. - In addition, an
upper sealing portion 14 in which theflat surface portions 11 and theside surface portions 12 are sealed together is formed at the upper portion of thegusset bag 10, and alower sealing portion 15 in which the inner surfaces of theflat surface portions 11 and the inner surfaces of theside surface portions 12 are heat-sealed together is formed at the lower portion of thegusset bag 10. Accordingly, the contents can be contained in thegusset bag 10. - The
flat surface portions gusset bag 1. - The
flat surface portion 11 is formed of a film member. Examples of the film member include a single-layer film and a multilayer film having a multilayer structure. In terms of adding various functions, the film member of theflat surface portion 11 is preferably a multilayer film, and more preferably a multilayer film having a heat-sealable innermost layer, a functional layer, and an outermost layer. - Examples of a film which is used as the innermost layer include an unstretched film formed of one or more selected from a group consisting of polyolefin resins such as low-density polyethylene (LDPE), medium-density polyethylene, high-density polyethylene, polypropylene (PP), and linear low-density polyethylene (LLDPE), mixed resins thereof, an ionomer resin, an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-acrylic acid methyl copolymer, and an ethylene-methacrylic acid copolymer. The thickness of the innermost layer is preferably in the range of 30 to 200 µm.
- As a film which is used as the outermost layer, a film having high mechanical suitability and printability is preferably used. Examples thereof include films formed of synthetic resins such as polyester, polyamide, polypropylene, polycarbonate, and polyacetal. These films may be unstretched films, or stretched films stretched uniaxially or biaxially. In terms of printability, a uniaxially or biaxially oriented film is preferably used. Specific examples thereof include an oriented plastic films and the like such as biaxially oriented polyethylene terephthalate (PET), biaxially oriented polyamide (ONY), and biaxially oriented polypropylene (OPP). In addition, if necessary, synthetic paper, cellophane, paper, nonwoven cloth and the like can also be used. The thickness of the outermost layer is preferably in the range of 12 to 25 µm.
- The functional layer can be appropriately selected in accordance with required functions such as gas barrier properties, mechanical toughness, flex resistance, pierce resistance, shock resistance, wear resistance, cold resistance, heat resistance, and chemical resistance.
- Examples of a film which is used for the functional layer include metal foils such as aluminum, iron, copper, tin and the like, films of polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-vinyl acetate copolymer saponification product, and the like, films obtained by applying polyvinylidene chloride to the above films or vapor-depositing an inorganic material such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, and magnesium oxide, films of polyvinylidene chloride, nonwoven cloth having heat insulating properties, and a foamed film.
- The functional layer may be a single layer or two or more layers. The thickness of the functional layer may satisfy the functions which are required for the
gusset bag 10, and is preferably in the range of 6 to 20 µm. - In addition, as a film which is used for the outermost layer, a vapor-deposited film having a vapor-deposited layer provided thereon may be used in place of providing the functional layer on a film member of the
flat surface portion 11. - Examples of a vapor-deposited layer include inorganic materials such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, magnesium oxide and the like.
- Specific examples of the film member of the
flat surface portion 11 include, for example, a film formed of PET (12 µm)/Al (7 µm)/ONY (15 µm)/LLDPE (60 µm) in order from the outermost layer. - The same member as the film member of the
flat surface portion 11 can be used as a film member of theside surface portion 12. The material of at least the innermost layer of the film member of theside surface portion 12 is preferably the same as the material of the innermost layer of the film member of theflat surface portion 11 in terms of sealability. - The
spout 20 has anextraction tube 21 which is inserted into thegusset bag 10 to extract the contents, and acap 22 which is screwed to the upper portion of theextraction tube 21 to close the extraction port of theextraction tube 21. Thespout 20 is liquid-tightly attached to theupper sealing portion 14 by heat-sealing in a state in which theextraction tube 21 is sandwiched between the upper edge portions of theflat surface portions - As a material of the
spout 20, the material of at least a part of theextraction tube 21 which is sealed with the inner surface of theflat surface portion 11 is a synthetic resin. - Examples of a synthetic resin which forms at least the sealing portion of the
extraction tube 21 of thespout 20 include a polyolefin resin, a polyamide resin, a polyester resin, a (meth)acrylic resin, a vinyl chloride resin, a vinylidene chloride resin, polyether sulfone, an ethylene-vinyl alcohol copolymer and the like. Among them, a polyolefin resin is preferably used in terms of excellent workability and low cost. - Examples of a polyolefin resin include a polyethylene-based resin such as high-density polyethylene, medium-density polyethylene, high-pressure-process low-density polyethylene, linear low-density polyethylene, and an ethylene-vinyl acetate copolymer, an olefin-based elastomer such as an ethylene-α-olefin copolymer, a polypropylene-based resin such as polypropylene, an ethylene-propylene random copolymer, and an α-olefin-propylene random copolymer, a cyclic polyolefin resin and the like. These resins may be blended to improve the performance, or may be partially cross-linked for the purpose of improvement in heat resistance and the like.
- The
spout 20 may be formed of a single material, or may be formed to have a multilayer structure formed of various resin layers. - In terms of sealability, the resin which forms at least the sealing portion of the
extraction tube 21 of thespout 20 is preferably the same as the resin which forms the innermost layer of theflat surface portion 11. - As shown in
FIGS. 2 and3 , in the spout-attachedgusset bag 1 of this embodiment, a folded-back portion 13b which is a part of the sideedge sealing portion 13 in the width direction thereof is folded back toward theside surface portion 12. Furthermore, the folded-back portion 13b folded toward theside surface portion 12 is adhesively fixed to a base end portion of the sideedge sealing portion 13. - Accordingly, as shown in
FIGS. 2 to 4 , even in a state in which contents are contained in thegusset bag 10 so that the sideedge sealing portion 13 projects toward the outside of thegusset bag 10, anend portion 13a of the sideedge sealing portion 13 with an edge which is relatively sharp faces thegusset bag 10, and does not project to the outside of thegusset bag 10. In place of theend portion 13a, a foldedline portion 13c which is rounder than theend portion 13a projects on the outside of thegusset bag 10. - In this manner, since the folded-
back portion 13b of the sideedge sealing portion 13 of the spout-attachedgusset bag 1 is folded back and adhesively fixed as described above, theangular end portion 13a of the sideedge sealing portion 13 does not touch one's hand but the foldedline portion 13c which is rounder than theend portion 13a touches the hand when the spout-attachedgusset bag 1 is squeezed. Accordingly, it is possible to push out the contents by squeezing thegusset bag 10 while causing the hand little pain. - In addition, in the side
edge sealing portion 13, since the folded-back portion 13b is folded back and adhesively fixed, a total of four film members, that is, the twoflat surface portions side surface portions back portion 13b is adhesively fixed, the spout-attachedgusset bag 1 has an excellent self-standing property. - The folded-
back portion 13b of the sideedge sealing portion 13 can be adhesively fixed by an adhesive. Examples of an adhesive include an adhesive in which a polyester resin is dispersed, a hot melt agent and the like. In addition, when the material of the outer surfaces of theflat surface portions side surface portions back portion 13b of the sideedge sealing portion 13 may be welded by heat-sealing. - In addition, since the two
flat surface portions side surface portion 12 folded toward the inside of thegusset bag 10 overlap each other at the side edge of theupper sealing portion 14, the four film members overlap each other. In this case, when the folded-back portion 13b of the sideedge sealing portion 13 is also folded back and adhesively fixed in theupper sealing portion 14, the number of film members increases by an amount corresponding to the folded-back portion 13 at the side edge of theupper sealing portion 14, and thus the eight film members overlap each other. In this manner, when the number of film members increases at the side edge of theupper sealing portion 14, the overlapping state of the film members in theupper sealing portion 14 becomes non-uniform. In addition, when the number of overlapping film members increases at the side edge of theupper sealing portion 14, the pressure is not sufficiently applied to the vicinity of the center of theupper sealing portion 14 at the time of sealing, and thus there is concern that the sealing is not completely performed in the vicinity of thespout 20 and the contents leak. - Therefore, as shown in
FIGS. 1 and4 , in theupper sealing portion 14 of the spout-attachedgusset bag 1, the folded-back portion 13b of the sideedge sealing portion 13 is preferably removed. Accordingly, theupper sealing portion 14 becomes uniform and the sealing can thus be easily and sufficiently performed, whereby the contents are easily prevented from leaking. - In the sealing of the outer surfaces of the
side surface portions upper sealing portion 14, for example, as shown inFIGS. 9B and 9C , punch holes are formed at positions facing each other in the vicinities of the side edges of theside surface portions inner surfaces flat surface portions portions 16. In addition, the outer surfaces of theside surface portions upper sealing portion 14 may be directly adhered to each other by an adhesive, a heat-sealable film or a double-sided adhesive tape. - Examples of a method of manufacturing the gusset bag of the invention include a method (β) having the following steps (β1) to (β4).
- (β1) A step of conveying two long film members (C) which form flat surface portions and a plurality of long film members (D) which are center-folded along the longitudinal direction and form side surface portions so that the plurality of center-folded film members (D) are in parallel to each other between the two film members (C), the fold lines of the center-folded film members (D) positioned at both ends are directed to the inside, and the fold lines of the film members (D) parallel to each other are alternately directed to the right and left, to heat-seal the respective side edge portions of each of the film members (D) to each of the two film members (C) along the longitudinal direction.
- (β2) a step of cutting the heat-sealed film members (C) and (D) between the side edge portions, facing each other, of the two film members (D) along the longitudinal direction to obtain a plurality of cylindrical film members having the flat surface portions and the side surface portions in which four side edge sealing portions are formed.
- (β3) a step of folding back all or a part of the side edge sealing portion in the width direction toward the flat surface portion or the side surface portion.
- (β4) a step of heat-sealing and cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to divide the cylindrical film member into a plurality of pieces in the longitudinal direction.
- When the spout is attached, in the step (β4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- Hereinafter, the case of the spout-attached
gusset bag 1 will be taken as an example and described in detail. - As shown in
FIG. 5A , two long film members (C) 11B which form the pair offlat surface portions 11 facing each other and a plurality of long film members (D) 12B which are center-folded along the longitudinal direction and form the pair ofside surface portions 12 facing each other are conveyed by a roller or the like. At this time, the plurality of film members (D) 12B are disposed in parallel to each other between the two film members (C) 11B. In addition, the film members (D) 12B are disposed so that the fold lines of the center-folded film member (D) 12B positioned at both ends are directed to the inside, and the fold lines of the film members (D) 12B parallel to each other are alternately directed to the right and left. - In addition, in this example, as shown in
FIG. 5B , an adhesive is applied to anadhesion portion 13d for the case in which the folded-back portion 13b is adhesively fixed. - Next, by heat-sealing the respective side edge portions of each of the film members (D) 12B to each of the two film members (C) 11B along the longitudinal direction, heat-sealing
portions 13B to be the sideedge sealing portions 13 of the spout-attachedgusset bag 1 are formed. - The heat-sealing
portion 13B of the film members (C) 11B and (D) 12B is cut along the straight line R, that is, along the longitudinal direction between the side edge portions, facing each other, of the two film members (D) 12B to cut out a plurality of cylindrical film members having theflat surface portions side surface portions edge sealing portions 13 are formed as shown inFIGS. 7 and 8 . - In addition, at this time, in a portion corresponding to the folded-
back portion 13b of the sideedge sealing portion 13, a sealingportion 13e is removed so that the folded-back portion 13b is removed at theupper sealing portion 14 of the spout-attachedgusset bag 1. - Each folded-
back portion 13b of the sideedge sealing portion 13 in the cylindrical film member obtained in the step (β3) is folded back toward theside surface portion 12 to be adhesively fixed by the adhesive applied to theadhesion portion 13d. - With regard to the cylindrical film member, the inner surfaces of the
flat surface portions 11 and the inner surface of theside surface portions 12 at a portion to be thelower sealing portion 15 are heat-sealed to each other along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (C) 11B and (D) 12B. Then, the film members (C) 11B and (D) 12B are cut along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (C) 11B and (D) 12B, and divided into a plurality of pieces in the longitudinal direction to obtain bag-shaped film members in which thelower sealing portion 15 is formed in the lower portions of theflat surface portions 11 and theside surface portions 12. - Next, in the upper portions of the
flat surface portions 11 and theside surface portions 12 of the bag-shaped film member as one of the plurality of pieces into which the cylindrical film member is divided, the sealing of the inner surfaces of theflat surface portions 11 and the contact surfaces of theflat surface portion 11 and theside surface portion 12, and the attachment of thespout 20 are performed by heat-sealing. Furthermore, the outer surfaces of theside surface portions 12 are sealed together to form theupper sealing portion 14. Examples of a method of sealing the outer surfaces of theside surface portions 12 to each other in the upper sealing 14 include the following method. - As shown in
FIG. 9A , punchholes side surface portion 12 in the upper portion of the sideedge sealing portion 13, and as shown inFIGS. 9B and 9C , theinner surfaces flat surface portions 11 facing each other are brought into contact with each other and heat-sealed in the portions corresponding to the punch holes 12b, 12b to form a sealingportion 16, whereby the outer surfaces of theside surface portions 12 are sealed together. - In addition, as another method of sealing the outer surfaces of the
side surface portions 12 in theupper sealing portion 14 to each other, a method of fixing the outer surfaces of theside surface portions 12 to each other by using an adhesive, a heat-sealable film or a double-sided adhesive tape is provided as an example. - The spout-attached
gusset bag 1 can be obtained by the above-described steps. - The method (β) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- In the step (β4), any of the operation of forming the
lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming theupper sealing portion 14 and attaching thespout 20 may be performed first, or the operations may be performed at the same time. For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout. - In addition, the operation of folding back and adhesively fixing the side
edge sealing portion 13 in the step (β3) is not limited to being before the step (β4). For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed. In addition, in accordance with the used material of the film member, the sideedge sealing portion 13 may be fixed by heat-sealing without using the adhesive. - In addition, examples of a method of manufacturing the gusset bag other than the method (β) include a method (γ) having the following steps (γ1) to (γ4).
- (γ1) A step of conveying two long film members (E) which form flat surface portions and a plurality of long cylindrical film members (F) which form side surface portions so that the plurality of film members (F) are in parallel to each other between the two film members (E) to heat-seal the center portions of the film members (F) and the two film members (E) along the longitudinal direction.
- (γ2) a step of cutting the heat-sealing portions of the film members (E) and (F) along the longitudinal direction to obtain a cylindrical film member having the flat surface portions and the side surface portions in which four side edge sealing portions are formed.
- (γ3) a step of folding back all or a part of the side edge sealing portion in the width direction toward the flat surface portion or the side surface portion.
- (γ4) a step of heat-sealing and cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to divide the cylindrical film member into a plurality of pieces in the longitudinal direction.
- When the spout is attached, in the step (γ4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- Hereinafter, the case of the spout-attached
gusset bag 1 will be taken as an example and described in detail. - As shown in
FIG. 6A , two long film members (E) 11A which form the pair offlat surface portions 11 facing each other and a plurality of long cylindrical film members (F) 12A which form the pair ofside surface portions 12 facing each other are conveyed by a roller or the like so that the plurality of film members (F) 12A are in parallel to each other between the two film members (E) 11A. In this example, as shown inFIG. 6B , an adhesive is applied to theadhesion portion 13d for the case in which the folded-back portion 13b is adhesively fixed. - Next, by heat-sealing the center portions of the film members (F) 12A and the two film members (E) 11A along the longitudinal direction, heat-sealing
portions 13A to be the sideedge sealing portions 13 of the spout-attachedgusset bag 1 are formed. In this example, the heat-sealingportion 13A is formed so that the center portion thereof in the direction perpendicular to the longitudinal direction is not heat-sealed. - The heat-sealing
portion 13A of the film members (E) 11 A and (F) 12A is cut along the straight line X, that is, along the longitudinal direction at the non-heat-sealed portion of the center portion of the heat-sealingportion 13A to cut out a plurality of cylindrical film members having theflat surface portions side surface portions edge sealing portions 13 are formed as shown inFIGS. 7 and 8 . - In addition, at this time, in a portion corresponding to the folded-
back portion 13b of the sideedge sealing portion 13, the sealingportion 13e is removed so that the folded-back portion 13b is removed at theupper sealing portion 14 of the spout-attachedgusset bag 1. - Each folded-
back portion 13b of the sideedge sealing portion 13 in the cylindrical film member obtained in the step (γ2) is folded back toward theside surface portion 12 to be adhesively fixed by the adhesive applied to theadhesion portion 13d. - With regard to the cylindrical film member, the inner surfaces of the
flat surface portions 11 and the inner surface of theside surface portions 12 at a portion to be thelower sealing portion 15 are heat-sealed to each other along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (E) 11A and (F) 12A. Then, the film members (E) 11A and (F) 12A are cut along the straight line Y, that is, along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction of the film members (E) 11 A and (F) 12A, and divided into a plurality of pieces in the longitudinal direction to obtain bag-shaped film members in which thelower sealing portion 15 is formed in the lower portions of theflat surface portions 11 and theside surface portions 12. - Next, in the upper portions of the
flat surface portions 11 and theside surface portions 12 of the bag-shaped film member as one of the plurality of pieces into which the cylindrical film member is divided, the sealing of the inner surfaces of theflat surface portions 11 and the contact surfaces of theflat surface portion 11 and theside surface portion 12, and the attachment of thespout 20 are performed by heat-sealing. Furthermore, the outer surfaces of theside surface portions 12 are sealed together to form theupper sealing portion 14. The method of sealing the outer surfaces of theside surface portions 12 in the upper sealing 14 can be performed in the same manner as in the step (β4) of the method (β). - The spout-attached
gusset bag 1 can be obtained by the above-described steps. - The method (γ) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- In the step (γ4), any of the operation of forming the
lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming theupper sealing portion 14 and attaching thespout 20 may be performed first, or the operations may be performed at the same time. For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout. - In addition, the operation of folding back and adhesively fixing the side
edge sealing portion 13 in the step (γ3) is not limited to being before the step (γ4). For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed. In addition, in accordance with the used material of the film member, the sideedge sealing portion 13 may be fixed by heat-sealing without using the adhesive. - In addition, in the step (1), when the film members (E) 11 A and (F) 12A are heat-sealed to form the heat-sealing
portion 13A, the center portion of the film member (F) 12A in the width direction may not be in a non-heat-sealed state, and may be continuously heat-sealed. - In addition, in the step (γ1), together with the film members (E) 11A and (F) 12A, the same long film members center-folded along the longitudinal direction as those in the method (β) are preferably conveyed so as to be placed at both side ends of the two film members (E) 11A so that the fold lines thereof are directed to the inside, to heat-seal the side edge portions of the center-folded film members and the two film members (E) 11A. Accordingly, it is possible to make full use of both side ends of the film member (E) 11A in the manufacturing of the gusset bag.
- As a method of manufacturing the spout-attached
gusset bag 1, the method (β) is more preferably used than the method (γ). - In the above-described spout-attached
gusset bag 1, the folded-back portion 13b of the sideedge sealing portion 13 in which the side edge portion of theflat surface portion 11 and the side edge portion of theside surface portion 12 are heat-sealed together is folded back toward theside surface portion 12 and adhesively fixed. Accordingly, when thegusset bag 1 is squeezed by one's hand, theend portion 13a does not touch the hand, but the foldedline portion 13c touches the hand. Since the foldedline portion 13c is round with no edges, one's hand is caused to feel little pain even when the contents are pushed out by squeezing thegusset bag 1. - The gusset bag of this embodiment is not limited to the above-described spout-attached
gusset bag 1. For example, as shown inFIG. 10A , the folded-back portion 13b of the sideedge sealing portion 13 may be folded back toward theflat surface portion 11 and adhesively fixed. In addition, as shown inFIG. 10B , the entire sideedge sealing portion 13 may be folded back toward theflat surface portion 11 and adhesively fixed to theflat surface portion 11. In addition, as shown inFIG. 10C , the entire sideedge sealing portion 13 may be folded back toward theside surface portion 12 and adhesively fixed to theside surface portion 12. - In the gusset bag of the invention, the entire side
edge sealing portion 13 is preferably folded back toward theflat surface portion 11 or theside surface portion 12. - In addition, as shown in
FIGS. 10B and 10C , when the entire sideedge sealing portion 13 is folded back in the manufacture of the gusset bag by the method (γ), in place of the cutting the film members (E) 11 A and (F) 12A along the straight line X, the film members are preferably cut along the straight line Z as shown inFIG. 11 , that is, the film members are preferably cut so that the sideedge sealing portion 13 is further shortened. - Particularly, in the manufacturing method when the entire side
edge sealing portion 13 is folded back toward theflat surface portion 11 or theside surface portion 12, it is preferable to use a method of folding back and adhesively fixing the entire sideedge sealing portion 13 in a state in which a quadrangular prism-shaped mandrel 40 (support) is inserted into the cylindrical film member formed of theflat surface portions side surface portions FIG. 12 . When using this method, it is possible to easily fold back and adhesively fix the sideedge sealing portion 13, and thus the spout-attached gusset bag can be more efficiently manufactured. - In addition, in the spout-attached gusset bag of this embodiment, two or more of the four kinds of folding-back methods illustrated in
FIGS. 3 and 10A to 10C may be used in combination for the four sideedge sealing portions 13. That is, in the gusset bag of this embodiment, a form of folding back the entire sideedge sealing portion 13 and a form of folding back a part of the sideedge sealing portion 13 may be used in combination, and a form of folding back the sideedge sealing portion 13 toward theflat surface portion 11 and a form of folding back the sideedge sealing portion 13 toward theside surface portion 12 may be used in combination. - In addition, the number of the side
edge sealing portions 13 is not limited to four, and may be less than four. A spout-attached gusset bag in which the number of the sideedge sealing portions 13 is not four is preferably a spout-attached gusset bag in which one flat surface portion and a pair of side surface portions are formed of one film member, and the side edge portions of the side surface portions formed of the above film member and the side edge portions of the other flat surface portion are heat-sealed together to form the two side edge sealing portions. - Specifically, as shown in
FIG. 13A , the spout-attached gusset bag preferably has agusset bag 10A in which theflat surface portion 11 to be the front surface of the bag and the pair ofside surface portions 12 facing each other are formed of one integrated film member, the side edge portions of theside surface portions flat surface portion 11 are heat-sealed together to form the two sideedge sealing portions 13, and a part of the sideedge sealing portion 13 is folded back toward theside surface portion 12 and adhesively fixed. In thisgusset bag 10A, the entire sideedge sealing portion 13 may be folded back, the sideedge sealing portion 13 may be folded back toward theflat surface portion 11, or these may be used in combination. - In addition, as shown in
FIG. 13B , the spout-attached gusset bag particularly preferably has agusset bag 10B in which theflat surface portion 11 to be the front surface of the bag and the pair ofside surface portions 12 facing each other are formed of one integrated film member, the side edge portions of theside surface portions flat surface portion 11 are heat-sealed together to form the two sideedge sealing portions 13, and the entire sideedge sealing portion 13 is folded back toward thefront surface portion 11 which forms the rear surface and adhesively fixed. The spout-attached gusset bag having thegusset bag 10B has no side edge sealing portion in the front surface, and thus one's hand is caused to feel little pain particularly when squeezing the bag from the front surface, and the appearance is also excellent. In addition, since the side edge sealing portions are formed of the flat surface portion which form the rear surface and the side surface portions at both sides of the flat surface portion, an excellent self-standing property can be obtained due to the side edge sealing portion functioning as a support, and the swelling of the body portion when containing contents is also suppressed. - According to the invention, as shown in
FIG. 13C , the spout-attached gusset bag of the invention may be a gusset bag 10C in which one side surface portion and a pair of flat surface portions facing each other are integrally formed of one film member , the two sideedge sealing portions 13 by heat-sealing are formed only in the side of the other side surface portion, and the sideedge sealing portion 13 is folded back toward the flat surface portion or the side surface portion and adhesively fixed. - In addition, when the
flat surface portion 11 and theside surface portion 12 are formed of a film member integrated at any portion, as shown inFIG. 13D , the sideedge sealing portion 13 may be formed by heat-sealing a portion corresponding to the side edge portion of theflat surface portion 11 and a portion corresponding to the side edge portion of theside surface portion 12 to each other, and all or a part of the sideedge sealing portion 13 may be folded back toward theflat surface portion 11 or theside surface portion 12, and adhesively fixed. Accordingly, it is possible to prevent one's hand from feeling pain when the gusset bag is squeezed and improve the self-standing property of the spout-attached gusset bag by forming the side edge sealing portion to be a support. - In addition, the folded-
back portion 13b of the sideedge sealing portion 13 may not be necessarily adhesively fixed to theflat surface portion 11 or theside surface portion 12 if the folded-back state can be stably maintained. - Examples of a method of manufacturing the gusset bag having the same form as those of the
gusset bags - (α1) A step of conveying a long film member (A) which forms one flat surface portion and a pair of side surface portions with a long film member (B) which forms the other flat surface portion in a state in which the long film member (A) is folded so that a plurality of the one flat surface portion and the pair of side surface portions are formed in parallel to each other along the longitudinal direction, to heat-seal the portion between the neighboring side surface portions of the film member (A) to the film member (B) along the longitudinal direction and heat-seal each of the portions at the side ends from the side surface portions positioned at both ends of the film member (A) to the film member (B) along the longitudinal direction.
- (α2) a step of cutting the heat-sealing portion of the film members (A) and (B) along the longitudinal direction to obtain a plurality of cylindrical film members having the flat surface portions and the side surface portions in which two side edge sealing portions are formed.
- (α3) a step of folding back all or a part of the side edge sealing portion in the width direction toward the flat surface portion or the side surface portion.
- (α4) a step of heat-sealing and cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to divide the cylindrical film member into a plurality of pieces in the longitudinal direction.
- When the spout is attached, in the step (α4), the spout is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided is sealed.
- Hereinafter, the case of a spout-attached gusset bag having the
gusset bag 10B will be taken as an example and described in detail. - As shown in
FIG. 14A , a long film member (A) 17 which forms oneflat surface portion 11 and the pair ofside surface portions flat surface portion 11 in a state in which the film member (A) 17 is folded so that a plurality of the oneflat surface portion 11 and the pair ofside surface portions FIG. 14B , an adhesive is applied to theadhesion portion 13d for the case in which the folded-back portion is adhesively fixed. - Next, the portion between the neighboring
side surface portions 12 of the film member (A) 17 and the film member (B) 18 are heat-sealed together along the longitudinal direction, and each of the portions at the side ends from the side surface portions positioned at both ends of the film member (A) 17 and the film member (B) 18 are heat-sealed together along the longitudinal direction, whereby the heat-sealingportions 13C to be the sideedge sealing portions 13 are formed. - The heat-sealing
portion 13C of the film members (A) 17 and (B) 18 is cut along the straight line Q, that is, along the longitudinal direction at the center portion of the heat-sealingportion 13C to cut out a plurality of cylindrical film members having theflat surface portions side surface portions edge sealing portions 13 are formed as shown inFIG. 15 . - In addition, if necessary, in the same manner as in the method (β), a part of a portion corresponding to the side
edge sealing portion 13 is removed so that no folded-back portion remains in the upper sealing portion of the spout-attached gusset bag. - Each of the entire side
edge sealing portions 13 of the cylindrical film member obtained in the step (α2) is folded back toward theflat surface portion 11 to be adhesively fixed by the adhesive applied to theadhesion portion 13d. - In the same manner as in the step (β4) of the method (β), the heat-sealing and cutting are performed along the direction perpendicular to the longitudinal direction and the division into a plurality of pieces is performed in the longitudinal direction, whereby bag-shaped film members are obtained in which the
lower sealing portion 15 is formed. Then, in the same manner as in the step (β4) of the method (β), the sealing of the upper portions of theflat surface portions 11 and theside surface portions 12 and the attachment of thespout 20 are performed. - The method (α) is preferably the above-described method in terms of ease of manufacturing, but is not limited to the above-described method.
- In the step (α4), any one of the operation of forming the
lower sealing portion 15, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming theupper sealing portion 14 and attaching thespout 20 may be performed first, or the operations may be performed at the same time. For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout. - In addition, the operation of folding back and adhesively fixing the side
edge sealing portion 13 in the step (α3) is not limited to being before the step (α4). For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the side edge sealing portions of the divided cylindrical film members may be folded back and adhesively fixed. In addition, in accordance with the used material of the film member, the sideedge sealing portion 13 may be fixed by heat-sealing without using the adhesive. - Next, another embodiment of the spout-attached gusset bag will be described. In this embodiment, the same parts as those in the spout-attached
gusset bag 1 will be denoted by the same reference signs, and descriptions thereof will be omitted. - As shown in
FIG. 16 , a spout-attachedgusset bag 2 of this embodiment has agusset bag 30 and aspout 20 liquid-tightly attached to thegusset bag 30. - As shown in
FIGS. 16 and 17 , thegusset bag 30 has a pair offlat surface portions side surface portions flat surface portions side surface portions gusset bag 30 byfolding lines 32a which are formed at corresponding positions to each other. Moreover, four sideedge sealing portions 33 are formed by heat-sealing the side edge portions of theflat surface portions 31 and the side edge portions of theside surface portions 32 together. In addition, anupper sealing portion 34 in which theflat surface portions 31 and theside surface portions 32 are put together and sealed is formed at the upper portion of thegusset bag 30, and alower sealing portion 35 in which the inner surfaces of theflat surface portions 31 and the inner surface of theside surface portions 32 are heat-sealed together is formed at the lower portion of thegusset bag 30. Accordingly, the contents can be contained in thegusset bag 30. - For the film members of the
flat surface portion 31 and theside surface portion 32, it is possible to use the same material as the film members of theflat surface portion 11 and theside surface portion 12 of the spout-attachedgusset bag 1, and a preferred aspect regarding the film member is similar. That is, the spout-attachedgusset bag 2 is the same as the spout-attachedgusset bag 1, other than the form of the sideedge sealing portion 33. - As shown in
FIGS. 17 and18 , the sideedge sealing portion 33 of the spout-attachedgusset bag 2 has an unsealedportion 33b which is not heat-sealed along the vertical direction in the middle of the sideedge sealing portion 33 in the width direction thereof. A tip end portion (folded-back portion 33c) of the sideedge sealing portion 33 is folded back toward theside surface portion 32 along the unsealedportion 33b, and adhesively fixed to a base end portion of the sideedge sealing portion 33. That is, in order from the base end of the sideedge sealing portion 33 toward the tip end, a sealingportion 33a which is heat-sealed, the unsealedportion 33b which is not heat-sealed, and the folded-back portion 33c which his heat-sealed are provided. - In the spout-attached
gusset bag 2, the tip end of a portion projecting to the outside from thegusset bag 30 of the sideedge sealing portion 33 is the unsealedportion 33b. Since the unsealedportion 33b is not heat-sealed, the unsealedportion 33b has lower rigidity and is softer than the foldedline portion 13c of the sideedge sealing portion 13 of the spout-attachedgusset bag 1. - In addition, in the spout-attached
gusset bag 2, since the sealingportion 33a and the folded-back portion 33c are heat-sealed together, these portions sufficiently function as a support, and thus thegusset bag 2 has an excellent self-standing property. - The spout-attached
gusset bag 2 is manufactured in the same manner as in the manufacturing of the spout-attachedgusset bag 1 by the method (β) or (γ), except for the form of the heat-sealing portion which is formed in the step (β2) or (γ2) and the folding-back of the side edge sealing portion in the step (β3) or (γ3). When the method (γ) is used, for example, the following method is exemplified. - As shown in
FIG. 6A , two long film members (E) 31 A which form the pair offlat surface portions 31 facing each other and a plurality of long cylindrical film members (F) 32A which form the pair ofside surface portions 32 facing each other are conveyed by a roller or the like so that the plurality of film members (E) 32A are in parallel to each other between the film members (E) 31 A. In addition, in this example, as shown inFIG. 19 , an adhesive is applied to anadhesion portion 33d for the case in which the folded-back portion 33c is adhesively fixed. - By heat-sealing the center portions of the film members (F) 32A and the film members (E) 31 A along the longitudinal direction, heat-sealing portions to be the side
edge sealing portions 33 are formed. The heat-sealing portions are formed in order of a sealingportion 33A which is heat-sealed, an unsealedportion 33B which is not heat-sealed, a sealingportion 33C which is heat-sealed, an unsealedportion 33B which is not heat-sealed, and a sealingportion 33A which is heat-sealed, in the direction perpendicular to the longitudinal direction. - The heat-sealing portion of the film members (C) 31 A and (D) 32A is cut along the straight line P, that is, along the longitudinal direction at the center of the
film member 32A in the direction perpendicular to the longitudinal direction to cut out a plurality of cylindrical film members having theflat surface portions side surface portions edge sealing portions 33 are formed as shown inFIG 20 . - In addition, as in the case of manufacturing the spout-attached
gusset bag 1, a part of the folded-back portion 33c is removed so that the folded-back portion 33c does not remain in a portion corresponding to theupper sealing portion 34 of the spout-attachedgusset bag 2. - Each folded-
back portion 33c of the sideedge sealing portions 33 in the cylindrical film members obtained in the step (γ2) is folded back toward theside surface portion 32 along the unsealedportion 33b to adhesively fix the folded-back portion 33c by the adhesive applied to theadhesion portion 33d. - As in the case of manufacturing the spout-attached
gusset bag 1, with regard to the cylindrical film member, the inner surfaces of theflat surface portions 31 and the inner surface of theside surface portions 32 at a portion to be thelower sealing portion 35 are heat-sealed to each other along the direction perpendicular to the longitudinal direction with a predetermined interval in the longitudinal direction, and the above portion is cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, whereby bag-shaped film members in which thelower sealing portion 35 is formed in the lower portions of theflat surface portions 31 and theside surface portions 32 are obtained. - Next, in the upper portions of the
flat surface portions 31 and theside surface portions 32 of the bag-shaped film member as one of the plurality of pieces into which the cylindrical film member is divided, the sealing of the inner surfaces of theflat surface portions 31 and the contact portions of theflat surface portion 31 and theside surface portion 32, and the attachment of thespout 20 are performed by heat-sealing. Furthermore, the outer surfaces of theside surface portions 32 are sealed together to form theupper sealing portion 34. Examples of a method of sealing the outer surfaces of theside surface portions 32 to each other in the upper sealing 34 include a method including: forming punch holes facing each other in theside surface portions 32 at the upper portions of the sideedge sealing portions 33; and bringing the inner surfaces of theflat surface portions 31 into contact with each other in the punch holes to heat-seal the inner surfaces to each other as in the case of manufacturing the spout-attachedgusset bag 1. In addition, a method of fixing the outer surfaces of theside surface portions 32 to each other by using an adhesive, a heat-sealable film or a double-sided adhesive tape may also be used. - The spout-attached
gusset bag 2 can be obtained by the above-described steps. - The method of manufacturing the spout-attached
gusset bag 2 is also not limited to the above-described method as in the case of manufacturing the spout-attachedgusset bag 1. - Any of the operation in the step (β4), the operation of forming the
lower sealing portion 35, the operation of cutting the cylindrical film member along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, and the operation of forming theupper sealing portion 34 and attaching thespout 20 may be performed first, or the operations may be performed at the same time. For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the lower portions of the divided cylindrical film members may be sealed and the upper portions thereof may be sealed with the attached spout. - In addition, the operation of folding back and adhesively fixing the folded back
portion 33c of the sideedge sealing portion 33 in the step (β3) is not limited to being before the step (β4). For example, after the cylindrical film member was cut along the direction perpendicular to the longitudinal direction to be divided into a plurality of pieces in the longitudinal direction, the folded-back portions 33c of the sideedge sealing portions 33 of the divided cylindrical film members may be folded back and adhesively fixed. In addition, in accordance with the used material of the film member, the sideedge sealing portion 13 may be fixed by heat-sealing without using the adhesive. - In addition, also in the case of manufacturing the spout-attached
gusset bag 2, in the step (γ1), together with the film members (E) 31A and (F) 32A, the long film members center-folded along the longitudinal direction are preferably conveyed so as to be placed at both side ends of the two film members (E) 31A so that the fold lines thereof are directed to the inside, to heat-seal the side edge portions of the center-folded film members and the two film members (E) 31 A. Accordingly, it is possible to make full use of both side ends of the film member (E) 31 A in the manufacturing of the gusset bag. In forming of the heat-sealing of the side edge portions of the center-folded film members and the two film members (E) 31A, a sealing portion which is heat-sealed, an unsealed portion which is not heat-sealed, and a sealing portion which is heat-sealed are formed in this order, in the direction perpendicular to the longitudinal direction. - In the above-described spout-attached
gusset bag 2, the folded-back portion 33c of the sideedge sealing portion 33 in which the side edge portion of theflat surface portion 31 and the side edge portion of theside surface portion 32 are heat-sealed together is folded back toward theside surface portion 32 along the unsealedportion 33b and adhesively fixed. Accordingly, when the spout-attachedgusset bag 2 is squeezed by one's hand, the round unsealedportion 33b which is not heat-sealed and has low rigidity touches the hand. Therefore, it is possible to push out the contents by squeezing the spout-attachedgusset bag 2 while causing the hand to feel little pain. - The spout-attached gusset bag of this embodiment is not limited to the above-described spout-attached
gusset member 2. For example, the folded-back portion 33c may be folded back toward theflat surface portion 11 and adhesively fixed. In addition, in the four sideedge sealing portions 33, the side edge sealing portions in which the folded-back portion 33c is folded back toward theflat surface portion 11 and the side edge sealing portions in which the folded-back portion 33c is folded back toward theside surface portion 12 may be used in combination. - In addition, the number of the side
edge sealing portions 33 is not limited to four, and may be less than four. For example, a film member in which one side surface portion is formed integrally with a pair of flat surface portions facing each other may be used to form the sideedge sealing portions 33 by heat-sealing only in the side of the other side surface portion, and the folded-back portion 33c may be folded back along the unsealedportion 33b and adhesively fixed. - In addition, when a film member in which the
flat surface portion 31 and theside surface portion 32 are formed integrally with each other at any portion is used, the sideedge sealing portion 33 may be formed by heat-sealing a portion corresponding to the side edge portion of theflat surface portion 31 and a portion corresponding to the side edge portion of theside surface portion 32 to each other, and the folded-back portion 33c of the sideedge sealing portion 33 may be folded back toward theflat surface portion 31 or theside surface portion 32 along the unsealedportion 33b, and adhesively fixed. Accordingly, it is possible to prevent one's hand from feeling pain when the gusset bag is squeezed and improve the self-standing property of the gusset bag by forming the side edge sealing portion to be a support. - In addition, the spout-attached gusset bag of the invention may be a spout-attached gusset bag having a gusset bag in which the folding-back of the side edge sealing portion described in the first embodiment and the folding-back of the side edge sealing portion described in the second embodiment are used in combination.
- In addition, the gusset bag of the invention is a bag which is the same as the above-described spout-attached gusset bag, except that the gusset bag of the invention has no spout. In this gusset bag, a notch or a cutoff line to open the bag may be formed.
- According to the invention, it is possible to provide a gusset bag which has an excellent self-standing property and causes one's hand to feel little pain even when squeezing the gusset bag, and to provide a spout-attached gusset bag having the gusset bag with a spout attached thereto.
-
- 1, 2:
- SPOUT-ATTACHED GUSSET BAG
- 10:
- GUSSET BAG
- 11:
- FLAT SURFACE PORTION
- 12:
- SIDE SURFACE PORTION
- 13:
- SIDE EDGE SEALING PORTION
- 13a:
- END PORTION OF SIDE EDGE SEALING PORTION
- 13b:
- FOLDED-BACK PORTION
- 13c:
- FOLDED LINE PORTION
- 14:
- UPPER SEALING PORTION
- 15:
- LOWER SEALING PORTION
- 20:
- SPOUT
- 30:
- GUSSET BAG
- 31:
- FLAT SURFACE PORTION
- 32:
- SIDE SURFACE PORTION
- 33:
- SIDE EDGE SEALING PORTION
- 33a:
- SEALING PORTION
- 33b:
- NONSEALING PORTION
- 33c:
- FOLDED-BACK PORTION
- 40:
- MANDREL
Claims (5)
- A gusset bag (10, 30) comprising:a pair of flat surface portions (11, 31) facing each other; anda pair of side surface portions (12, 32) facing each other which are folded toward the inside thereof, whereinthe gusset bag (10, 30) has a side edge sealing portion (13, 33) in which the flat surface portion (11, 31) and the side surface portion (12, 32) are heat-sealed together at side edge portions thereof,characterized in thatone flat surface portion (11, 31) and the pair of side surface portions (12, 32) are formed of one film member, andside edge portions of the side surface portions (12, 32) opposite to the one flat surface portion (11, 31) formed of the film member and side edge portions of the other flat surface portion (11, 31) are heat-sealed together to form the two side edge sealing portions (13, 33), andthe gusset bag (10, 30) has a folded-back portion (13b, 33c) in which the entire side edge sealing portion (13, 33) is folded back and adhesively fixed to the flat surface portion (11, 31) or the side surface portion (12, 32) so that the entire side edge sealing portion (13, 33) is overlapped with the flat surface portion (11, 31) or the side surface portion (12, 32).
- The gusset bag (10, 30) according to Claim 1, whereinthe pair of flat surface portions (11, 31) and the pair of side surface portions (12, 32) have no folded-back portion at upper end portions thereof.
- A spout-attached gusset bag (1, 2), whereina spout (20) is attached to an opening portion of the gusset bag (10, 30) according to Claim 1 or 2.
- A method of continuously manufacturing the gusset bag (10, 30) according to Claim 1, the method comprising:(α1) a step of conveying a first long film member (17) which forms one flat surface portion (11, 31) and a pair of side surface portions (12, 32) with a second long film member (18) which forms the other flat surface portion (11, 31) in a state in which the first long film member (17) is folded so that a plurality of the one flat surface portion (11, 31) and the pair of side surface portions (12, 32) are formed in parallel to each other along a longitudinal direction, to heat-seal a portion between the neighboring side surface portions (12, 32) of the first film member (17) to the second film member (18) along the longitudinal direction and heat-seal each of the portions at the side ends of the side surface portions (12, 32) positioned at both ends of the first film member (17) to the second film member (18) along the longitudinal direction;(α2) a step of cutting a heat-sealing portion of the first and second film members (17, 18) along the longitudinal direction to obtain a plurality of cylindrical film members having the flat surface portions (11, 31) and the side surface portions (12, 32) in which the two side edge sealing portions (13, 33) are formed;(α3) a step of folding back all or a part of the side edge sealing portion (13, 33) in the width direction toward the flat surface portion (11, 31) or the side surface portion; and (α4) a step of heat-sealing and cutting the cylindrical film member along a direction perpendicular to the longitudinal direction to divide the cylindrical film member into a plurality of pieces in the longitudinal direction,characterized in that
in the step of folding back the side edge sealing portion (13, 33), the entire side edge sealing portion (13, 33) is adhesively fixed to the flat surface portion (11, 31) or the side surface portion (12, 32) so that the entire side edge sealing portion (13, 33) is overlapped with the flat surface portion (11, 31) or the side surface portion (12, 32). - A method of manufacturing a spout-attached gusset bag (1, 2) using the method of manufacturing the gusset bag (10, 30) according to Claim 4, whereina spout (20) is attached when an upper portion of one of the plurality of pieces into which the cylindrical film member is divided in the longitudinal direction is sealed.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2009195613 | 2009-08-26 | ||
JP2009292065 | 2009-12-24 | ||
JP2010188480A JP5593165B2 (en) | 2009-08-26 | 2010-08-25 | Gazette bag, gusset bag with mouth member, and manufacturing method thereof |
PCT/JP2010/064501 WO2011024906A1 (en) | 2009-08-26 | 2010-08-26 | Gusset bag, gusset bag with mouth member, and method for manufacturing them |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2471723A1 EP2471723A1 (en) | 2012-07-04 |
EP2471723A4 EP2471723A4 (en) | 2013-10-23 |
EP2471723B1 true EP2471723B1 (en) | 2016-06-22 |
Family
ID=43628006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10811955.3A Active EP2471723B1 (en) | 2009-08-26 | 2010-08-26 | Gusset bag, gusset bag with mouth member, and method for manufacturing them |
Country Status (7)
Country | Link |
---|---|
US (1) | US9630759B2 (en) |
EP (1) | EP2471723B1 (en) |
JP (1) | JP5593165B2 (en) |
KR (1) | KR101385016B1 (en) |
CN (1) | CN102482005B (en) |
AU (1) | AU2010287526B2 (en) |
WO (1) | WO2011024906A1 (en) |
Families Citing this family (27)
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- 2010-08-26 CN CN201080037231.XA patent/CN102482005B/en active Active
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KR101385016B1 (en) | 2014-04-14 |
EP2471723A4 (en) | 2013-10-23 |
WO2011024906A1 (en) | 2011-03-03 |
CN102482005B (en) | 2014-12-10 |
US9630759B2 (en) | 2017-04-25 |
CN102482005A (en) | 2012-05-30 |
JP2011148549A (en) | 2011-08-04 |
AU2010287526A1 (en) | 2012-03-29 |
JP5593165B2 (en) | 2014-09-17 |
US20120170876A1 (en) | 2012-07-05 |
AU2010287526B2 (en) | 2013-11-28 |
EP2471723A1 (en) | 2012-07-04 |
KR20120035941A (en) | 2012-04-16 |
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